.corewidth {
  width: 1200px;
}

.m-a {
  margin: 0 auto;
}

.fl {
  float: left;
}

.fr {
  float: right;
}

.clearfix:before, .clearfix:after {
  content: "";
  display: block;
  clear: both;
}

html,
body {
  color: #3a3a3a;
  font: 12px/1.5 "Helvetica Neue", Helvetica, Arial, "Microsoft Yahei", "Hiragino Sans GB", "Heiti SC", "WenQuanYi Micro Hei", sans-serif;
}
